Archaeology turnin change?

Would love some independent verification on this. Might be chance, but...

I turned in artifacts today and got a Pristine artifact. (Two in a row, yay!)

However, when I used the crates to buy Tol'vir artifacts, an interesting thing happened. All three crates contained not only Tol'vir fragments, but a Tol'vir Heiroglyphic as well. I've probably turned in 100 of these crates to date and never seen a single item like that.

Is this an existing behavior that I just got wild luck streaks on, or is this an undocumented change?

Received my first keystone yesterday and I turned in quite a few artifacts (150+) and spent them all on Tol'Vir crates. Can't tell if it's just coincidence that my first crate since the patch contained a keystone or not.

The Pristine ones definately aren't anything new, they are just kind of rare. But if you did a decent amount of Archaeology, you'll find quite a few. Getting pristines for all is a bit more difficult...

Received my first keystone yesterday and I turned in quite a few artifacts (150+) and spent them all on Tol'Vir crates. Can't tell if it's just coincidence that my first crate since the patch contained a keystone or not.

The Pristine ones definately aren't anything new, they are just kind of rare. But if you did a decent amount of Archaeology, you'll find quite a few. Getting pristines for all is a bit more difficult...

So it seems like keystones may be a new addition to the purchased crates in patch 5.1, just not at 100% drop rate.